1211226681 has 32 divisors (see below), whose sum is σ = 1869557760. Its totient is φ = 683214336.

The previous prime is 1211226677. The next prime is 1211226739. The reversal of 1211226681 is 1866221121.

It is not a de Polignac number, because 1211226681 - 2² = 1211226677 is a prime.

It is a super-2 number, since 2×1211226681² = 2934140145532551522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211226671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1464190 + ... + 1465016.

It is an arithmetic number, because the mean of its divisors is an integer number (58423680).

Almost surely, 2^1211226681 is an apocalyptic number.

It is an amenable number.

1211226681 is a deficient number, since it is larger than the sum of its proper divisors (658331079).

1211226681 is an equidigital number, since it uses as much as digits as its factorization.

1211226681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653.

The product of its digits is 2304, while the sum is 30.

The square root of 1211226681 is about 34802.6820949191. The cubic root of 1211226681 is about 1065.9622126733.

The spelling of 1211226681 in words is "one billion, two hundred eleven million, two hundred twenty-six thousand, six hundred eighty-one".